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qemu/hw
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Denis Plotnikov c9b7d9ec21 virtio: increase virtqueue size for virtio-scsi and virtio-blk 
The goal is to reduce the amount of requests issued by a guest on
1M reads/writes. This rises the performance up to 4% on that kind of
disk access pattern.

The maximum chunk size to be used for the guest disk accessing is
limited with seg_max parameter, which represents the max amount of
pices in the scatter-geather list in one guest disk request.

Since seg_max is virqueue_size dependent, increasing the virtqueue
size increases seg_max, which, in turn, increases the maximum size
of data to be read/write from a guest disk.

More details in the original problem statment:
https://lists.gnu.org/archive/html/qemu-devel/2017-12/msg03721.html

Suggested-by: Denis V. Lunev <den@openvz.org>
Signed-off-by: Denis Plotnikov <dplotnikov@virtuozzo.com>
Message-id: 20200214074648.958-1-dplotnikov@virtuozzo.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2020-02-22 08:26:47 +00:00
..
9pfs hw/9pfs/9p-synth: added directory for readdir test 2020-02-08 09:29:04 +01:00
acpi mem: move nvdimm_device_list to utilities 2020-02-21 09:15:03 +11:00
adc hw/*/Makefile.objs: Move many .o files to common-objs 2020-02-04 09:00:57 +01:00
alpha hw/core/loader: Let load_elf() populate a field with CPU-specific flags 2020-01-29 19:28:52 +01:00
arm arm: allwinner: Wire up USB ports 2020-02-21 16:07:02 +00:00
audio add device_legacy_reset function to prepare for reset api change 2020-01-30 16:02:03 +00:00
block virtio: increase virtqueue size for virtio-scsi and virtio-blk 2020-02-22 08:26:47 +00:00
char hw/char/exynos4210_uart: Fix memleaks in exynos4210_uart_init 2020-02-13 14:14:55 +00:00
core virtio: increase virtqueue size for virtio-scsi and virtio-blk 2020-02-22 08:26:47 +00:00
cpu qdev: set properties with device_class_set_props() 2020-01-24 20:59:15 +01:00
cris hw/core/loader: Let load_elf() populate a field with CPU-specific flags 2020-01-29 19:28:52 +01:00
display Fix memory leak with fdt 2020-02-20 16:51:19 +00:00
dma bcm2835_dma: Re-initialize xlen in TD mode 2020-02-07 14:04:28 +00:00
gpio hw/*/Makefile.objs: Move many .o files to common-objs 2020-02-04 09:00:57 +01:00
hppa hw/hppa/dino: Do not accept accesses to registers 0x818 and 0x82c 2020-02-18 11:22:10 -08:00
hyperv add device_legacy_reset function to prepare for reset api change 2020-01-30 16:02:03 +00:00
i2c aspeed/i2c: Prevent uninitialized warning 2020-02-06 11:13:24 +01:00
i386 hw/i386/vmmouse: Fix crash when using the vmmouse on a machine without vmport 2020-02-06 11:02:48 +01:00
ide add device_legacy_reset function to prepare for reset api change 2020-01-30 16:02:03 +00:00
input hw/input: Do not enable CONFIG_PCKBD by default 2020-02-04 09:01:31 +01:00
intc target/arm: Test correct register in aa32_pan and aa32_ats1e1 checks 2020-02-21 16:07:02 +00:00
ipack qdev: set properties with device_class_set_props() 2020-01-24 20:59:15 +01:00
ipmi qdev: set properties with device_class_set_props() 2020-01-24 20:59:15 +01:00
isa hw/input: Do not enable CONFIG_PCKBD by default 2020-02-04 09:01:31 +01:00
lm32 hw/core/loader: Let load_elf() populate a field with CPU-specific flags 2020-01-29 19:28:52 +01:00
m68k hw/m68k/next-cube: Remove superfluous semicolon 2020-02-18 20:20:49 +01:00
mem spapr: Add NVDIMM device support 2020-02-21 09:15:04 +11:00
microblaze hw/core/loader: Let load_elf() populate a field with CPU-specific flags 2020-01-29 19:28:52 +01:00
mips hw/core/loader: Let load_elf() populate a field with CPU-specific flags 2020-01-29 19:28:52 +01:00
misc hw/misc/iotkit-secctl: Fix writing to 'PPC Interrupt Clear' register 2020-02-21 16:07:00 +00:00
moxie hw/core/loader: Let load_elf() populate a field with CPU-specific flags 2020-01-29 19:28:52 +01:00
net hw/net/rocker: Report unimplemented feature with qemu_log_mask(UNIMP) 2020-02-18 20:20:49 +01:00
nios2 hw/nios2:fix leak of fdevice tree blob 2020-02-19 10:32:50 +01:00
nubus hw/m68k: add Nubus support 2019-10-28 19:06:47 +01:00
nvram hw/*/Makefile.objs: Move many .o files to common-objs 2020-02-04 09:00:57 +01:00
openrisc hw/core/loader: Let load_elf() populate a field with CPU-specific flags 2020-01-29 19:28:52 +01:00
pci qdev: set properties with device_class_set_props() 2020-01-24 20:59:15 +01:00
pci-bridge qdev: set properties with device_class_set_props() 2020-01-24 20:59:15 +01:00
pci-host pnv/phb3: Add missing break statement 2020-02-21 09:15:04 +11:00
pcmcia hw/*/Makefile.objs: Move many .o files to common-objs 2020-02-04 09:00:57 +01:00
ppc hw/ppc/virtex_ml507:fix leak of fdevice tree blob 2020-02-21 09:15:04 +11:00
rdma qdev: set properties with device_class_set_props() 2020-01-24 20:59:15 +01:00
riscv riscv: virt: Use Goldfish RTC device 2020-02-10 12:01:38 -08:00
rtc hw: rtc: Add Goldfish RTC device 2020-02-10 12:01:37 -08:00
s390x hw/s390x/ipl: replace deprecated qdev_reset_all registration 2020-01-30 16:02:05 +00:00
scsi virtio: increase virtqueue size for virtio-scsi and virtio-blk 2020-02-22 08:26:47 +00:00
sd hw/*/Makefile.objs: Move many .o files to common-objs 2020-02-04 09:00:57 +01:00
semihosting semihosting: add qemu_semihosting_console_inc for SYS_READC 2020-01-09 11:41:29 +00:00
sh4 sh4: Fix PCI ISA IO memory subregion 2020-02-21 16:07:02 +00:00
smbios hw/smbios/smbios: Remove unused include 2020-02-06 10:38:57 +01:00
sparc hw/core/loader: Let load_elf() populate a field with CPU-specific flags 2020-01-29 19:28:52 +01:00
sparc64 hw/core/loader: Let load_elf() populate a field with CPU-specific flags 2020-01-29 19:28:52 +01:00
ssi xilinx_spips: Correct the number of dummy cycles for the FAST_READ_4 cmd 2020-02-21 16:07:02 +00:00
timer stm32f2xx_timer: delay timer_new to avoid memleaks 2020-02-07 14:04:28 +00:00
tpm hw/ppc/Kconfig: Enable TPM_SPAPR as part of PSERIES config 2020-02-02 14:07:57 +11:00
tricore hw/core/loader: Let load_elf() populate a field with CPU-specific flags 2020-01-29 19:28:52 +01:00
unicore32
usb hcd-ehci: Introduce "companion-enable" sysbus property 2020-02-21 16:07:02 +00:00
vfio hw/vfio/display: Remove superfluous semicolon 2020-02-18 20:20:49 +01:00
virtio * Register qdev properties as class properties (Marc-André) 2020-01-27 09:44:04 +00:00
watchdog qdev: set properties with device_class_set_props() 2020-01-24 20:59:15 +01:00
xen qdev: set properties with device_class_set_props() 2020-01-24 20:59:15 +01:00
xenpv trivial: Remove xenfb_enabled from sysemu.h 2020-02-04 09:00:57 +01:00
xtensa hw/xtensa/xtfpga:fix leak of fdevice tree blob 2020-02-19 10:33:38 +01:00
Kconfig Remove the core bluetooth code 2019-12-17 09:01:14 +01:00
Makefile.objs Remove the core bluetooth code 2019-12-17 09:01:14 +01:00